I recently purchased a Mac Pro (late 2013) and discovered that the Energy Saver Pane is a little different; most notably, the Computer Sleep slider is missing. Here is how to get it back.
First, use the following terminal commands to determine the model and board ID of your computer:
sysctl hw.model | awk '{ print $2 }' ioreg -l | awk -F\" '/board-id/ { print $4 }'
Second, navigate to the following folder:
cd /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/X86PlatformPlugin.kext/Contents/Resources/
Third, determine the .plist file that corresponds to the model and board ID of your computer; e.g., Mac-F60DEB81FF30ACF6.plist.
Fourth, modify the file that corresponds to the model and board ID of your computer:
sudo vi /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/X86PlatformPlugin.kext/Contents/Resources/Mac-UDID.plist
Fifth, change the following line:
UnifiedSleepSliderPref
to
UnifiedSleepSliderPref
Sixth, regenerate kext cache by “touching” the Extensions directory:
sudo touch /System/Library/Extensions
Finally, wait a minute just to make sure the system has enough time to finish regenerating the kext cache. Then, reboot your mac.
Alas, you will once again have the two-slider pane.
